I got a 1973 9.5hp Johnson "lowboy" motor. I finally got it to start and run pretty good but she really smokes. Ive replaced the coils, points, condensers, plugs, needle, seat, float and the o-ring around the slow speed needle. It seems like its running too rich, but if I lean up the slow idle adjustment it just coughs and dies out. She has good spark in both cylinders. I have 5 of these kind of motors and got 4 of them running very good...this one is giving me fits. Any ideas what could a motor to smoke too much?